<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>vw </title>
    <style>
        *{
            margin: 0;padding:0;
        }
        #banner{
            width: 94.375vw;
            height: 35vw;
            margin: 13.125vw auto;
            background: #666;
        }
    </style>
</head>
<body>
    <div id="banner"></div>
</body>
</html>